Financial and Other Derivative Instruments (Fair Value of Derivative Instruments) (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 550	$ 711
Derivative Liabilities	(629)	(705)
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	550	711
Derivative Liabilities	(629)	(705)
DTE Electric | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	4	3
Natural Gas
Derivatives, Fair Value [Line Items]
Derivative Assets	298	387
Derivative Liabilities	(375)	(383)
Natural Gas | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	298	387
Derivative Liabilities	(375)	(383)
Electricity
Derivatives, Fair Value [Line Items]
Derivative Assets	239	307
Derivative Liabilities	(240)	(305)
Electricity | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	239	307
Derivative Liabilities	(240)	(305)
Other
Derivatives, Fair Value [Line Items]
Derivative Assets	7	5
Derivative Liabilities	(11)	(10)
Other | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	7	5
Derivative Liabilities	(11)	(10)
Foreign currency exchange contracts
Derivatives, Fair Value [Line Items]
Derivative Assets	6	12
Derivative Liabilities	(3)	(7)
Foreign currency exchange contracts | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	6	12
Derivative Liabilities	(3)	(7)
Financial transmission rights | DTE Electric | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Derivative Assets	4	3
Current derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	429	570
Current derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	(442)	(521)
Noncurrent derivative asset
Derivatives, Fair Value [Line Items]
Derivative Assets	121	141
Noncurrent derivative liability
Derivatives, Fair Value [Line Items]
Derivative Liabilities	$ (187)	$ (184)